JPH0146616B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing bulky yarn having excellent anti-pilling properties. The present inventors first intertwined an undrawn polyester yarn and a semi-drawn yarn (partially drawn yarn), and then stretched them simultaneously to generate slack in the stretched yarn due to the difference in elastic recovery. He proposed a method to make it bulkier (Patent Application No. 1983-45941). However, it has been found that one problem with this method is that pilling tends to occur when a rough fabric with a low density or a soft fabric with a thin single fiber denier is produced. As a result of further studies to overcome the above-mentioned drawbacks, the present inventors used a modified polyester containing a third component as the undrawn yarn that becomes slack in the above-mentioned yarn, and hot-stretched it at a natural stretching ratio or lower. The inventors have discovered that the pilling property is improved by a synergistic effect with the effect of That is, in the present invention, a modified polyester undrawn yarn containing the third component and a polyester semi-drawn yarn (partially drawn yarn) are intertwined in advance, and then this is intertwined with a polyester semi-drawn yarn (partially drawn yarn) at a stretching ratio equal to or lower than the natural drawing ratio of the undrawn yarn, and the semi-drawn yarn is This is a method for producing anti-pilling bulky yarn, which is characterized in that the yarn is hot-stretched at a stretching ratio higher than the natural stretching ratio, and then the stretching tension is released to create a difference in elastic rotation between the two yarns to make them bulky. To explain the present invention in more detail using a specific example, FIG.
-2.5 mol% sodium sulfoisophthalate
2 is a copolymerized modified polyester undrawn yarn (natural drawing ratio 2.7 times), and 2 is a semi-drawn yarn (natural drawing ratio 1.3 times) made by spinning ordinary polyester that does not contain a third component at, for example, 3500 m/min. be. These are first intertwined with the air entangling nozzle 3, then preheated at 120°C with a hot roller 4, further heated to 200°C with a plate 5 and stretched 1.8 times with a stretching roller 6, and then The film is wound into a winder 7 with a tension lower than the stretching tension. In this case, since the undrawn yarn 1 is drawn at a low magnification below the natural stretching ratio, the yarn is still in the region of plastic deformation, and even if it is relaxed after leaving the roller 6 and the tension is released, it remains elastic. Although the amount returned by multiple rotations is extremely small, since the semi-drawn yarn 2 is drawn at a ratio higher than the natural drawing ratio, a strong elastic recovery force acts, and the drawing tension is released after exiting the roller 6. The thread tries to partially return due to elastic rotation. Since the two are intertwined in advance, the difference in elasticity is due to the large number of overhangs on the yarn (undrawn yarn 1), as shown in Figure 2.
It is formed by the yarn 1 after being drawn. ), and the yarn becomes a bulky yarn. Therefore, when made into a woven or knitted fabric, a bulky woven or knitted fabric that is flexible and highly bulky can be obtained. However, since this bulky yarn has a high bulky and loose structure, for example, when it is made into a coarse woven or knitted fabric, the surface fibers A large number of particles float up and grab onto each other, resulting in a so-called pilling condition. In particular, the thinner the single fiber denier of the floating fibers (that is, the fibers on the undrawn yarn 1 side), the greater this tendency to grab. However, this is the case when ordinary polyester is used as the undrawn yarn 1, and if a modified polyester is used as the undrawn yarn 1 as in this example, the occurrence of pilling can be significantly reduced as shown in the following table. found.

[Table] In other words, modified polyester generally tends to have better pilling resistance than ordinary polyester, but when applied to a yarn with a high bulk and loose structure like the present invention, it is difficult to prevent pilling from occurring. There is no effect. However, in the method of the present invention, the modified polyester is not drawn at a low ratio below the natural drawing ratio, and therefore the toughness of the fiber is very brittle, and the yarn with such properties becomes surface loose fibers and has a high degree of Since it is composed of bulky yarn, it becomes a bulky fabric with unprecedented pilling properties, and this effect is particularly enhanced for fine denier single fibers of 2 de or less (after drawing), which are prone to pilling. In this case, the semi-drawn yarn 2 constitutes the core of the bulky yarn and does not contribute to the occurrence of pilling, so ordinary polyester is sufficient. Alternatively, even if a modified polyester as mentioned above is used, in this case it will be drawn at a higher ratio than the natural drawing ratio, so it will not become brittle like in the case of semi-drawn yarn 1, and it can be safely used as a core yarn. It can be used. In particular, it is advantageous to use the same modified polyester in order to match the dyeing method between the yarns, and on the other hand, if you want to make the fabric stiff and stiff, it is better to use normal polyester. In addition to the above-mentioned examples, the modified polyester used here is suitably a copolymer containing a third component such as isophthalic acid, polyethylene glycol, diethylene glycol, adipic acid, and cyclohexanedimethanol, and the content thereof is 2 More than mol% is desirable. When spinning these yarns, it is desirable that the spinning speed be 2000 m/min or less for the undrawn yarn 1 and 2500 m/min or more for the semi-drawn yarn 2. In addition, as mentioned above, the drawing ratio should be lower than the natural drawing ratio of the undrawn thread 1 and less than the natural drawing ratio of the semi-drawn thread 2, since the undrawn thread 1 causes plastic deformation and the semi-drawn thread 2 undergoes elastic recovery after drawing. It is necessary to select a value that is higher than the stretching ratio. Also, the higher the heating temperature during stretching, the better.
In particular, when the drawing plate 5 is heated to a high temperature of 180° C. or higher, the undrawn yarn 1 is modified polyester and is drawn at a low magnification below the natural drawing ratio (that is, the molecular orientation is low).
Combined with this, the thread becomes brittle, further increasing its anti-pilling effect. Furthermore, regarding releasing the tension on the yarn after drawing, it is not necessary to reduce the tension to zero; if it is lower than the drawing tension, the yarn will undergo elastic regeneration and become bulky, so an appropriate value may be used. . For example, the tension of a normal winder or ring winder is sufficient. As described above, according to the method of the present invention, it is possible to rationally produce a woven or knitted fabric that is extremely soft and has good pilling properties in the stretching step.

[Brief explanation of drawings]

FIG. 1 is a process surface diagram showing one embodiment of the present invention, and FIG. 2 is an enlarged side view of a yarn structure obtained by the method of the present invention. 1... Modified polyester undrawn yarn, 2... High speed spun polyester undrawn yarn, 3... Air entangling nozzle, 4... Hot roller, 5... Heating plate, 6... Stretching roller, 7... Winder , 1'...undrawn yarn 1 extending over the surface of the bulky yarn,
2'...Partially drawn yarn 2 located in the core of the bulky yarn.

Claims (1)

[Claims] 1 A modified polyester undrawn yarn containing a third component and a polyester semi-drawn yarn (partially drawn yarn) are intertwined in advance, and then this is hot-stretched at a draw ratio higher than the natural draw ratio of the undrawn yarn, and then the stretched yarn is drawn. A method for producing anti-pilling bulky yarn characterized by creating a difference in elastic recovery between both yarns by releasing tension to make them bulky.